Crimping tool for paint can overseals



w. H. SWANSON 2,933,873

CRIMPING TOOL FOR PAINT CAN OVERSEALS April 26, 1960 2 Sheets-Sheet 1 Filed March 4, 1959 "'L d l F 2 599 :02 66 -wawazzzzzw 92 INVENTOR. Wuauau H. Swanson BY a g A-r-rv.

April 26, 1960 V w. H.SWANSON I 2,933,373

CRIMPING TOOL FOR PAINT CAN OVERSEALS Filed March 4, 1959 I 2 Sheets-Sheet 2 INVENTOR. wlLauau H. Swmsou ATTY.

containers by mail.

U ted es P t fl o 2,933,873 CRIMPENG TOOL FQR PAINT CAN OVERSEALS Wilhurn H. Swanson, Wilmette, Ill.

Application March 4, 1959,- Serial No. 797,204

8 Claims. (Cl. 53-334) The improved crimping tool comprising the present invention has been designed for use primarily in connection with theapplication of overseal rings to the rim regions of pre-sealed paint cans whereby the latter are protected in shipment against dislodgment of the conventional sealing lids associated with such paint cans and the consequent spillage of the can contents. The invention is, however, capable of other uses and the'crimping tool of the present invention may, if desired, with or without modification, be employed in connection with the application of deformable circular closures to the rim regions of cylindrical containers, whether such closures be in the form of overseals or original seals. Irrespective, however, of the particular use to which the invention may be put, the essential features thereof are at all times preserved.

. The United States mails are available to paint manufacturers for parcel post shipment of filled paint cans either singly or in small lots only when rigid postal requirements have been met. Heretofore, these requirements have stipulated that the usual circular disc-like lids employed for sealing the paint cans be soldered in their sealing position over the can opening to avoid any possible danger of the lids becoming dis odged during shipment. Not only are such soldering operations costly and time-consuming, but, additionally, they present difficulty to the consumer in opening the can for access to the contents thereof. Furthermore, the presence of solder in the vicinity of the can seal frequently prevents reapplication of the lid to a once opened container, it being necessary for properreapplication of the lid to effect the same relative circumferential orientation of the lid relative to the can rim which was present upon initial prying'of the lid to its open position. At a comparatively recent date, the Post Ofiice Department has approved for use an overseal ring which may be applied to the rim of a pre-sealed paint can and which, when in effective position thereon, presents a marginal edge which is beaded or rolled over the beaded rim of the container,

' and from which edge there projects inwardly an overlying annulus which extends radiallyinwardly above the marginal regions of the usual container lid and overlies the same in such a manner that not only does it operate in the manner of a limit stop to prevent outward movement of the container lid beyond the point at which leakage will occur, but it also renders the marginal regions of the lid inaccessible for prying purposes so that the container lid may not be voluntarily pried from the container without first removing and destroying the overseal ring.

Heretofore, in order to effectively apply such an overseal ring to a presealed container, relatively complicated and expensive equipment has been required, such equipment being ordinarily beyond the means of the average retailer who intends to occasionally ship individual paint Accordingly, the present invention contemplates the provision of a novel and effective hand tool by means of which such overseal ring may be eifec- Patente 2 tively applied to the rim of a presealed container bye rolling operation wherein the cylindrical flange or apron ordinarily associated with such overseal ring may be rolled or beaded beneath the marginal cylindrical beaded rim of the container body with a minimum of effort on the part of the operator.

The provision of a hand tool of this general character which will effectively perform its intended purpose constituting the principal general object of the invention, it is a further object to provide such a hand tool which is self-aligning so that it is merely necessary in the operation thereof to loosely apply the unbeaded overseal ring to the rim of the container and thereafter bring the applicator tool into approximate axial alignment with the container and overseal ring, after which the normal manipulation of the tool required to effect the rolling or beading operation will automatically move the tool into accurate alignment and operative register with the parts which are to be secured together.

The position of an applicator tool for paint container overseals which is extremely simple in its construction; one which is comprised of a minimum number of parts, particularly moving parts, and which, therefore, is uni likely to get out of order; one which is rugged and durable and, therefore, will withstand rough usage; one which may easily be assembled and disassembled for purposes of re; placement of parts or repair; one which requires no intricate machining in its manufacture thereby further con tributing toward low cost; one which is attractive in its appearance and pleasing in its design; and one which is well adapted to perform the services required of it, are further desirable features which have been borne in mind in the production and development of the present invention.

Numerous other objects and advantages of the invention, not at this time enumerated, will become more readily apparent as the following description ensues.

In the accompanying two sheets of drawings forming a part of this specification, a preferred embodiment of the invention has been shown.

In these drawings: I

Fig. 1 is a side elevational view of an applicator tool constructed in accordance with the principles of the present invention; 2 is'a bottom plan view of the structure shown in Fig. 3 is a sectional view taken substantially along the line 33 of Fig. 1; V

Fig. 4 isa sectional view taken substantially along the line 44 of Fig. 2 and showing the tool operatively posi tioned on a sealed container preparatory to actual performance of the beading operation whereby an overseal ring is applied to the container;

Fig. 5 is a side elevational view, similar to Fig. 4; showing the applicator tool in the position it assumesv during the actual beading operation;

Fig. 6 is an enlarged-detail fragmentary sectional view Referring now to the drawings in detail, aconv entionaf paint container or can body has been fr'agmentarily shown and designated in its entirety at 10. The container body includes a cylindrical side wall 12, the upper rim portion of which is provided with an out-turned flange l4. Beaded around this out-turned flange 14, in

the usual manner of construction of such containers; is

the circular peripheral rim region of an annular lid-supporting top wall structure 16 which forms a shelf-like support for the container lid proper 18. The general plane of the top wall 16 lies below the level of the outturned flange 14 on the side Wall 12 and the metal of the top wall extends upwardly as at 20, over and around the flange 14 as at 22 and then downwardly and again upwardly in reentrant fashion as at 24 to provide an external rolled bead in the uppermost peripheral regions of the container body 10. The top wall 16 is formed with an annular trough portion 26 near the inner peripheral edge thereof and this latter edge is rolled or beaded as at 28 for reinforcement purposes. The container lid 18 includes a circular disc-like inner hub portion 30 and the outer peripheral regions of the lid 18 is of an undulatorycharacter and provides inner and outer trough regions'32 and 34, respectively, the former lying just inside the bead 28 and the latter being adapted to seat within the trough portion 26 with a pressed fit when the lid 18 is in operative sealing position on the container body 10. The extreme outer periphery of the lid 18 is provided with an outwardly rolled bead 35. This bead, normally assumes a position slightly above the general plane of the top wall 16 so that the lid 18 as a Whole may be pried from its sealing position on the container by insertion of a suitable tool, such as a screw driver or the like. beneath the head 35 whereupon, utilizing the crown portion 22 of the top wall 16 as a reaction point or fulcrum, one side of the bead 35 may be lifted upwardly to release the lid 18.

In order to further seal the container 10 for parcel post shipment, an overseal ring designated in its entirety at 36 is applied to the upper rim region of the sealed container 10; This overseal ring includes a generally fiat annular wall 38 having a downturned outer marginal flange 40 which encompasses the'bead 35 and the lower region of which is rolled inwardly as at 42'beneath the head 35 and against the side wall 12 to retain the overseal ring securely in position on the container body 10. The inner peripheral region of the wall 38 is turned downwardly as at 44 and a series of upwardly struck short arcuate protuberances 46 are formed in a wall 38 in the outer peripheral regions thereof and serve a purpose that will be set forth presently.

- When the overseal ring 36 is in position on the container body 10, as previously described, the wall 38 overlies the top wall 16 of the container body and projects inwardly over the peripheral regions of the lid 18 including the well or trough portion 32 thereof and is slightly spaced above the rolled head 35. In this position of the overseal ring 36, access to the bead 35 for prying purposes is precluded while at the same time outward move ment of any portion of the lid 18 beyond the point at which the head 35 engages the wall 38 of the overseal is prevented. The distance between the bead 35 and wall 38 is extremely small so that outward movement ofthe lid 18 beyond the point where the seal between two interengaging trough portions 26 and 32 is opened up is not possible. In addition to serving its function as a safeguard against inadvertent or accidental dislodgment of the lid 18 from the container body 10, as, for example, upon dropping of the filled container, the overseal ring 36 serves as a measure of reinforcement for the rim regions of the sealed container.

As best seen in Fig. 7, the overseal ring 36 is provided with a tear-off strip or tab 47 which extends at least partially across the wall 38 as indicated by the score lines 48. Upon rupture of the score lines 48 and removal of the strip 47, the entire overseal may be withdrawn from the sealed container body 10.

Thearrangement of the container 10, its sealing lid 18 and the overseal ring 36 is purely conventional and no claim is made herein to any novelty associated with the same, the novelty of the present invention residing rather in the provision of an efi'icient applicator tool by means swea ersv of which the overseal 36 may be applied to the sealed container, and which applicator will now be described in detail.

The applicator tool of the present invention has been designated in its entirety at 50 and it is in the form of a hand tool whereby, by the use of manual pressure alone, an unfianged overseal ring blank 36' such as has been illustrated in Fig. 4 may readily be applied to the rim region of a container body 10 which has been filled to capacity and the lid 18 applied thereto in the manner previously described. The tool 50 involves in its general organization a circular base plate 52 which is adapted to be positioned over the container 10 so as to rest on the various crests of the upstruck protuberances 46 provided on the wall 38 of the overseal blank 36. The base plate 52 serves as a reaction member to assimilate the downward thrust which is applied by manual pressure to a series of heading heads or beading tools proper 54 which are constrained to move radially inwardly toward each other toward a common central vertical axis when such manual pressure is applied to these heads so that by their inward movement they will engage the depending cylindrical flange 40 provided on the overseal blank 36' to bead the lower region 42' of the flange inwardly beneath the flange 14 on the container wall 12 as indicated at 42 in Fig. 6. Subsequent tractional circumferential movement of the various beading heads 54 around the rim of the can in a manner that will be made clear presently serves to roll the portion 42 of the flange 36' to its final home position beneath the flange 14 and thus complete the application of the overseal ring 36 to the container body 10.

The flat circular plate or reaction disc 52 is preferably in the form of a steel casting of appreciable thickness and the central region thereof is provided with a raised hub 56 the crown portion 58 of which is provided with a ve1ti= cal bore 60 therethrough communicating with a socket 62 in the lower side of the plate. The upper peripheral edge of the plate 54 is bevelled as at 64 for clearance purposes as will be described subsequently, the bevelled portion 64 leaving a cylindrical peripheral surface 66.

Slidable in the bore 60 is the lower end of a combined thrust and torque-applying shaft 70, the end of the shaft extending completely through the bore and into the socket 62. A cap screw and washer assembly 72 is threaded into the lower end of the shaft 70 and serves to limit the extent of vertical sliding movement of the shaft within the bore.

Fixedly secured to the medial regions of the shaft 70 by means of a taper pin 74 or the like is a collar or hub 76. The collar has formed in the outer cylindrical surface thereof a series of three radially extending bores 78, arranged at 120 relative to one another. Fitted within each bore 78 is the inner or proximate end of a radially disposed supporting arm 80, a taper pin 82 or the like serving to retain each arm in position within the bore against turning movement therein. Adjacent the outer end of each arm there is formed an inclined bore 84 and in which bore there is anchored by means of a taper pin 85 or the like the upper end of a guide rod 86. The three guide rods '86 thus diverge outwardly and downwardly away from one another at angles of approxi mately 25 with the rods being disposed in respective vertical planes which subtend between themselves angles of Rotatably and slidably disposed on the lower distal end of each guide rod 86 is one of the previously mentioned beading heads 54. Each beading head 54 is in the form of a spool-shaped steel roller of integral construction and having a medial body portion 92 and upper and lower spool flanges 94 and 96, respectively. The two flanges 94 and 96 straddle the extreme outer rim or peripheral edge of the base plate 52 and the plate thus serves to retain the heading head 54 in position on the end region of the guide rod 86 against removal therefrom.-

A helical compression -spring 98 surrounds the guide rod 86, bears at its lower end against the upper radial face 100 of the beading head, and bears at its upper end against the underneath side of the adjacent supporting arm 80. The spring 98 thus serves at all times to force the beading head 90. downwardly on the guide rod 86 and cause the underneath or inside surface 102 (Fig. 6) of the upper spool flange '94 to tractionally engage the peripheral edge region of the upper flat surface of the base plate 52. This inside surface 102 of the upper spool flange 94 is of frusto-conical configuration and has a slant angle which is a supplement of the angle of deviation of the inclined guide rod 86. The frusto-conical surface 102 of the upper spool flange 94 thus makes tangential rolling contact with the flat rim region of the base plate 52 at all times under the yielding influence of the compression spring 98. I The extreme peripheral region of the flat upwardly facing surface of the base plate 52 thus constitutes, in eflect, a circular track on which the frusto-conical surface 102 of the spool-shaped beading head 54 is adapted to tractionally travel during application of the overseal 18 to the container 10 for purposes that will become clear presently.

The lower spool flange 9'6 constitutes a beading flange and it is designed for tractional beading engagement with the lower portion 42' of the cylindrical flange 40' of the overseal blank 36' during the beading operation. The width of the middle or spool body portion 92 is such that when the beading heads 54 are disposed on the respective guide rods 86 near the lower or distal ends of the latter with the cop screw and collar assembly 72 bearing against the bottom wall of the socket 62, the three beading flanges 56 make outside tangential contact with an imaginary circle which is of greater diameter than the diameter of the base plate 52 and which is also greater than the overall diameter'of the flange 14 at the upper rim of the container body Wall 12.

The extreme upper end of the vertical thrust and torque-applying shaft 70 carries an actuating or manipulating handle 104 which is'of cylindrical design and which is formed with a transverse socket 186 therein medially of its ends, the upper end of the shaft 70 being anchoredwithin the socket by means of a cross pin 108.

In the operation of the applicator tool '10 for applying an overseal blank 36' to a presealed container '10, the overseal blank is loosely positioned overthe upper rim of the container as shown in Fig. 4 so that the horizontal wall 38 of the overseal blank rests upon the crown portion 22 of the lid-supporting top wall structure 16. Thereafter, the base plate 52 of the applicator tool 10 is caused to be seated upon the overseal blank 36' with the underneath faceof the base plate 52 being supported on the crests of the various upstruck protuberances 46. In thus applying the base plate '52 to the upper regions of the container body and overseal, it is desirable that the base plate be approximately centered upon the container, or in other words, that the base plate and container be initially brought to a substantially coaxial condition. It is not necessary, however, that exact coincidence of the two parts he initially assumed since, upon manipulation of the tool in the intended manner, the base plate and container will be shifted relative to each other to ultimately establish such coaxial relationship, all in a manner that will become clear presently. It is to be noted at this point that with the base plate 52 resting upon the overseal blank 35' in the manner indicated above, the various beading flanges gd' will straddle the upper rim of the composite container body 10 with the. heading flanges remaining slightly spaced from the cylindrical flange 40' of the overseal blank 36' and in the same general horizontal plane thereof.

After the base plate '52 has been loosely positioned upon the upper end of, the composite container in the manner indicated above, downward pressure is applied manually to the handle 104 so as to force the thrust rod 70 axially downwardly from the position wherein it is illustrated in Fig. 4 tothe position" whcrein it is illus trated in Fig. 5. Upon such downward movement of the shaft 70, the cap screw and washer 72 will move away from the bottom wall of the socket 62 and the collar 76 will move bodily downwardly with the shaft 70.

Inasmuch as the three frusto-conical surfaces 102 o fthe upper spool flanges 94 bear tractionally against the upper surface of the base plate 52, the downward movement of the collar 76 will project the guide rods 86 downwardly and the various beading heads 54 will move radially inwardly and close upon the cylindrical flange 40 so as to engage the latter therebetween and force the lower region 42 of the flange 40' inwardly beneath the flange 14 on the container body wall 12. As soon as the beading flanges 96 have thus moved inwardly against the flange 40, the manipulating handle 104 is turned about the axis of the shaft 70 in one direction or the other and such turning movement of the handle 104 will be transmitted through the shaft 70 and collar 80 to the guide rods 86 and consequently to the beading heads 54 which will be. caused to travel around the 'c'irg cumference of the can body rim, whereupon the outer curved surfaces of the beading flanges 96 will cause the cylindrical flange 40' to be headed inwardly beneath the flange 14. Rotational movement of the entire ap'plica tor tool in this. fashion, with a degree of downward thrust being maintained upon the vertical shaft 70, will eflfect application of the overseal ring 36 to the can body 10 after an initial rotation of the tool through an angle of Any turning motion of the tool in excess of an initial 120 arc of movement will cause the paths of travel of the various beading flanges 96 to overlap so that a trailing flange 96 will move into a path previously travelled by a loading beading flange and thus the additional beading action effected will result in an extremely effective beading operation.

It is to be noted at this point that after initial seating of the base plate 52 upon the composite sealed con tainer 10, upon downward movement of the vertical shaft 70, the consequent inward motion of the various beading heads 54 will serve to automatically center the base plate 52 upon the upper end of the can body. This auto: matic centering operation will' take place as a result of the radial thrust which will be applied to the applicator tool as a whole by virtue of first one and then another of the beading heads '54 coming successively into contact with the depending overseal flange 40'. 7

After the overseal ring has been applied to the container body 10 in the manner indicated above, the handle 104 may be raised in such a manner as to elevate the shaft 70 and its attached collar 80, whereupon the vari-' ous springs 93 will force the beading heads 54 outwardly on the inclined guide rods 86, thus spreading these heads apart, so to speak, and causing them to clear the beaded' rim of the composite container. The applicator tool may then be lifted from the container assembly.

While one specific and preferred form of the im-' proved applicator tool of the present invention has been illustrated and described herein, itwill be understood that this form does not by any means indicate the only form contemplated. The form herein illustrated is merely one which has been developed for commercial application of the invention. The invention is, therefore,- not to be limited to the exact arrangement of parts shown and described herein as various changes in the details of construction may be resorted to without departing from the spirit of the invention. Only insofar as the invention has particularly been pointed out in the accompany ing claims is the same to be limited. 6 Having thus described the invention what I claim as: new and desire to secure by Letters Patent is:

1. The combination with a cylindrical container having an upper'marginal rim providing a continuous out-- turned bead therearound, and a cover blank for the container having a top wall supported on said rim and as depending marginal flange encompassing and extending;

below said bead, of an applicator tool for bending the lower region of said flange inwardly beneath said bead by a continuous rolling operation, said tool including a circular base plate adapted to be positioned on said top wall of the blank, and when so positioned, presenting an upwardly facing circular continuous track which overlies the rim region of the container and is substantially coextensive therewith, a rigid frame structure movably mounted on said base plate for axial sliding relative thereto and capable of free turning movement in opposite directions about the central axis of the base plate, said frame structure including a plurality of circumferentially spaced guide rods overlying the marginal rim of the container at spaced regions therearound, said guide rods being inclined relative to the vertical axis of the base plate and extending from regions which are disposed within the extended cylindrical confines of the container above the base plate vto regions which. aredisposed exteriorly of said cylindrical confines below the base plate, and a beading head rotatably and slidably mounted on each guide rod, each beading head having a traction surface in rolling contact with said continuous circular track, and a beading flange below said traction surface designed for rolling engagement with the depending marginal flange on said cover blank.

2. The combination with a cylindrical container having an upper marginal rim providing a continuous outturned bead therearound, and a cover blank for the container having a top wall supported on said rim and a depending marginal. flange encompassing and extending below said bead, of an applicator tool for bending the lower region of said flange inwardly beneath said head by a continuous rolling operation, said tool including a circular base plate adapted to be positioned on said top Wall of the blank, and when so positioned, presenting an upwardly facing circular continuous track which overlies the rir'nregion of the container and is substantially coextensive therewith, a rigid frame structure movably mounted on said base platefor axial sliding movement relative thereto and capable of free turning movement inopposite directions about the central axis of the base plate, said frame structure including a plurality of circumferentially spaced guide rods overlying the marginal rim of the container at spaced regions therearound, said guide rods being inclined relative to the vertical axis of the base plate and extending from regions which are disposed within the extended cylindrical confines of the container above the base plate to regions which are disposed exteriorly of said cylindrical confines below the base plate, and a beading head rotatably and slidably mounted on each guide rod, each beading head being in the form of a spool-shaped roller having an upper circular traction flange in tractional rolling contact with said upwardly facing continuous circular track, and a lower circular beading flange designed for rolling engagement with the depending marginal flange on said cover blank.

3. The combination set forth in claim 2 wherein said upper circular traction flange presents a frusto-conical traction surface in tangential contact with said upwardly facing continuous circular track on the base plate.

4. The combination with a cylindrical container having an upper marginal rim providing a continuous out-turned bead therearound, and a cover blank for the container having a' top wall supported on said rim and a depending marginal flange encompassing and extending below said bead, of an applicator tool for bending the lower region of said flange inwardly beneath said bead by a continuous rolling operation, said tool including a circularbase plate adapted toibe positioned on said top wall of the blank, and when so positioned, presenting an upwardly facing circular continuous track which overlies the rimregion'of the'container and is substantially co-' extensive 1therewith; a -rigid' frame structure movably mounted onlsaidbas'e plate for axial sliding movement relative thereto,;and;eapable of free turning movement in opposite directions about the central axis of the base plate, said frame structure including a plurality of circumferentially spaced guide rods overlying the marginal rim of the container at spaced regions therearound, said guide rods being inclined relative to the vertical axis of the base plate and extending from regions which are disposed within the extended cylindrical confines of the container above the base plate to regions which are disposed exteriorly of said cylindrical confines below the base plate, a beading head rotatably and slidably mounted on each guide rod, each beading head being in the form of a spool-shaped roller having an upper circular traction flange, and a lower circular beading flange spaced from the upper flange, said upper and lower flanges straddling the outer peripheral rim of the base plate, and spring means yieldingly urging each beading head downwardly along the respective guide rod on which it' is mounted to yieldingly urge said upper traction flange into rolling engagement with said upwardly facing circular track on the base plate.

5. The combination with a cylindrical container having an upper marginal rim providing a continuous out-turned bead therearound, and a cover blank for the container having a top wall supported on the rim and a depending marginal flange encompassing and extending below said bead, of a hand tool for bending the lower region of said flange inwardly beneath said head by a continuous rolling operation, said tool including a circular base plate adapted to be positioned on said top wall of the blank, and when so positioned, presenting an upwardly facing continuous circular track which overlies the rim region of the container and which is substantially coextensive therewith, a vertically disposed thrust and torque-applying shaft projecting through said base plate centrally thereof and slidable therein, a hub fixedly mounted on the central region of said shaft, a series of three horizontally disposed and radially extending arms projecting outwardly in divergent fashion from said hub at angles of from one another, a guide rod fixedly carried at the outer end of each arm, said guide rods being inclined relatively to the vertical axis of the base plate and extending from regions which are disposed within the extended cylindrical confines of the container above the base plate to regions which are disposed exteriorly of said cylindrical confines below said base plate, a beading head rotatably and slidably mounted on each guide rod, each beading head having a traction surface in rolling contact with said continuous circular track and a beading flange below said traction surface designed for rolling engagement with the depending marginal flange on said cover blank, and a thrust and torque-applying handle mounted on the upper end of said shaft.

6. The combination set forth in claim 5 including, additionally, a spring surrounding each guide rod and bearing at its upper end against one of said radially extending arms and at its lower end against one of said beading heads and serving to yieldingly maintain said traction surface in engagement with said circular track.

7. The combination with a cylindrical container having an upper marginal rim providing a continuous out-turned bead therearound, and a cover blank for the container having a top wall supported on the rim and a depending marginal flange encompassing and extending below said head, of a hand tool for bending the lower region of said flange inwardly beneath said bead by a continuous rolling operation, said tool including a circular base plate adapted to be positioned on said top wall of the blank, and when so positioned, presenting an upwardly facing continuous circular track which overlies the rim region of the container and which is substantially coextensive therewith, a vertically disposed thrust and torque-applying shaft projecting through said base plate centrally thereof and slidable therein, a hub fixedly mounted on the central region of said shaft, a series of three horizontally disposed and radially extending arms projecting outwardly in divergent fashion from said hub at angles of 120 from one another, a guide rod fixedly carried at the outer end of each arm, said guide rods being inclined relative to the vertical axis of the base plate and extending from regions which are disposed within the extended cylindrical confines of the container above the base plate to regions which are disposed exteriorly of said cylindrical confines below said base plate, and a heading head rotatably and slidably mounted on each guide rod, each beading head being in the form of a spool-shaped roller having an upper circular traction flange in rolling contact with said upwardly facing continuous circular track and a lower circular beading flange designed for rolling engagement with the depending marginal flange on said cover blank.

8. The combination with a cylindrical container having an upper marginal rim providing a continuous out-turned bead therearound, and a cover blank for the container having a top wall supported on the rim and a depending marginal flange encompassing and extending below said bead, of a hand tool for bending the lower region of said flange inwardly beneath said bead by a continuous rolling operation, said tool including a circular base plate adapted to be positioned on said top wall of the blank, and when so positioned, presenting an upwardly facing continuous circular track which overlies the rim region of the container and which is substantially coextensive therewith, a vertically disposed thrust and torque-applying shaft projecting through said base plate centrally thereof and slidable therein, a hubfixedly mounted on the central region of said shaft, a series of three horizontally disposed and radially extending arms projecting outwardly in divergent fashion from said hub at angles of from one another, a guide rod fixedly carried at the outer end of each arm, said guide rods being inclined relative to the vertical axis of the base plate and extending from regions which are disposed within the extended cylindrical confines of the container above the base plate to regions which are dis posed exteriorly of said cylindrical confines below said base plate, and a heading head rotatably and slidably mounted on each guide rod, each beading head being in the form of a spool-shaped roller having an upper circular traction flange and a lower circular beading flange spaced from the upper flange, said upper and lower flanges straddling the outer peripheral rim of the base plate, and spring means yieldingly urging each beading head downwardly along the respective guide rod on which it is mounted to yieldingly urge said upper traction flange into rolling engagement with said upwardly facing circular track on the base plate.

References Cited in the file of this patent UNITED STATES PATENTS 

